Assessment of a fast electro-optical shutter for 1D spontaneous Raman scattering in flames

Ajrouche, Hassan; Lo, A.; Vervisch, P.; Cessou, Armelle

doi:10.1088/0957-0233/26/7/075501

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…При освещении выбранной плоскости потока и панорамной регистрации СКР в процессе колебательно-вращательных переходов возможны изме-рения локальной концентрации молекул в областях без горения [6,7]. Развитие методов диагностики газовых реагирующих потоков на основе регистрации СКР остается актуальным и в настоящее время ввиду совершенствования оптоэлектронных устройств [8,9]. Целью настоящей работы является исследование влияния тепловыделения в процессе горения на пространственное распределение плотности в турбулентной закрученной струе на основе панорамной регистрации интенсивности СКР с использованием перестраиваемого фильтра Лио−Эмана.…”

Section: поступило в редакцию 18 мая 2017 гunclassified

Панорамная Спектроскопия Спонтанного Комбинационного Рассеяния Для Диагностики Струйных Реагирующих Потоков С Использованием Перестраиваемого Фильтра Лио-Эмана

Шараборин¹,

Маркович²,

Дулин³

2018

Письма В Журнал Технической Физики

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The spatial-density distribution in burning a premixed methane–air swirling turbulent jet has been studied by measuring the intensity of the Stokes branch of spontaneous Raman scattering for vibrational–rotational transitions in nitrogen. An optical system comprising a Nd:YAG laser and the liquid-crystalline Lyot–Ehman tunable filter has been created and tested by measuring the temperature and density fields in a cone-shaped laminar flame. It has been established that the difference of data obtained using the Stokes component of Raman scattering in nitrogen and its ratio to the anti-Stokes component does not exceed 5% in a temperature range from 300 to 1800 K.

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Section: поступило в редакцию 18 мая 2017 гunclassified

Панорамная Спектроскопия Спонтанного Комбинационного Рассеяния Для Диагностики Струйных Реагирующих Потоков С Использованием Перестраиваемого Фильтра Лио-Эмана

Шараборин¹,

Маркович²,

Дулин³

2018

Письма В Журнал Технической Физики

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“…An accurate measurement of CO 2 abundance is not only relevant for atmospheric sciences or paleoclimatology. In particular, Raman scattering is a useful tool for the quantitative diagnosis of combustion processes . Molecular spectroscopy is also fundamental in the study of the chemistry of astronomical sources, for example, planetary atmospheres and the interstellar medium…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Raman scattering is a useful tool for the quantitative diagnosis of combustion processes. [2,3] Molecular spectroscopy is also fundamental in the study of the chemistry of astronomical sources, for example, planetary atmospheres and the interstellar medium. [4] The detection of molecular species in spectral surveys involves the obtention of experimental spectra and the succeeding analysis of the recorded spectra, making use of an appropriate theoretical model for the calculation of molecular (ro)vibrational levels.…”

Section: Introductionmentioning

confidence: 99%

An algebraic alternative for the accurate simulation of CO₂ Raman spectra

Bermúdez-Montaña

Carvajal

Pérez‐Bernal

et al. 2020

J Raman Spectroscopy

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We present an accurate simulation of the Raman spectrum of the carbon dioxide molecule in the 1150–1500 cm−1 spectral range, comparing the results obtained using the three polyad schemes found in the literature of this molecule. The description of the molecule with the algebraic U1(2)×U(3)×U2(2) local model encompasses both stretching and bending degrees of freedom. A detailed analysis of the Hamiltonian interactions for the three polyad schemes provides fittings with root mean square deviations in the range 0.14–0.20 cm−1, involving 19 parameters taking into account the 178 experimental term energies found in the literature. Using a limited subset of 9 experimental transition moments, we optimize 5 partial derivatives of the mean polarizability and simulate the Raman spectrum of CO2 for the three polyad schemes. Comparing the calculated results with the experimental spectrum, we obtain an overall good agreement for the three polyads. However, an inspection in detail of the spectrum seems to show a slight preference for polyad P212 albeit not due to the interaction characterizing the polyad but due to anharmonic effects and energy distribution. Finally, we assess the effect of the Fermi resonance over CO2 Raman line intensities.

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“…Detailed experimental data not only lead to further understanding of the spray behavior from the injector, but also provide valuable knowledge to enhance computational modelling capabilities. Over the past few years, different optical diagnostics have been widely developed to characterize and optimize diesel spray [4] (such as Laser induced fluorescence [5], Spontaneous Raman scattering [6][7], Mie scattering [8], PIV [9], DBI, etc…). However, due to the visible light scattering, which is strongly refracted from droplets in the dense near nozzle area, the analysis of the spray dense core by these techniques has been limited.…”

Section: Introductionmentioning

confidence: 99%

“…Since 2000, the absorption of X-ray, generated by Argonne's Advanced Photon Source has been developed to understand the near-nozzle spray better [9][10][11][12]. The X-ray radiography technique is perhaps one of few methods able to measure the liquid mass distributions in otherwise complex sprays [7][8][9] permitting analyses that cannot be performed using optical spray diagnostics. This greatly simplifies the analysis as the attenuation signal can be related to the liquid mass density in the path of the X-rays with minimal sensitivity to the droplet size.…”

Section: Introductionmentioning

confidence: 99%

X-ray diagnostics of dodecane jet in spray A conditions using the new one shot engine (NOSE)

Ibrahim

Ajrouche

Nilaphai

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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Quantifying liquid mass distribution data in the dense near nozzle area to develop and optimize diesel spray by optical diagnostic is challenging. Optical methods, while providing valuable information, have intrinsic limitations due to the strong scattering of visible light at gas-liquid boundaries. Because of the high density of the droplets near the nozzle, most optical methods are ineffective in this area and prevent the acquisition of reliable quantitative data. X-ray diagnostics offer a solution to this issue, since the main interaction between the fuel and the X-rays is absorption, rather than scattering, thus X-ray technique offers an appealing alternative to optical techniques for studying fuel sprays. Over the last decade, x-ray radiography experiments have demonstrated the ability to perform quantitative measurements in complex sprays. In the present work, an X-ray technique based on X-ray absorption has been conducted to perform measurements in dodecane fuel spray injected from a single-hole nozzle at high injection pressure and high temperature. The working fluid has been doped with DPX 9 containing a Cerium additive, which acts as a contrast agent. The first step of this work was to address the effect of this dopant, which increases the sensitivity of X-ray diagnostics due its strong photon absorption, on the behavior and the physical characteristics of n-dodecane spray. Comparisons of the diffused back illumination images acquired from ndodecane spray with and without DPX 9 under similar operating conditions show several significant differences. The current data show clearly that the liquid penetration length is different when DPX 9 is mixed with dodecane. To address this problem, the dodecane was doped with a several quantities of DPX containing 25% ± 0.5 of Cerium. Experiments show that 1.25% of Ce doesn't affect the behaviour of spray. Radiography and density measurements at ambient pressure and 60 bars are presented. Spray cone angle around 5° is obtained. The obtained data shows that the result is a compromise between the concentration of dopant for which the physical characteristics of the spray do not change and the visualization of the jet by X-ray for this concentration. KeywordsDiesel Spray, Engine, X-ray radiography, high pressure high temperature chamber, dodecane, Cerium, spray diagnostics Introduction New One Shot Engine (NOSE) has been designed to simulate the thermodynamic conditions at High PressureHigh Temperature (HPHT) like an actual common-rail diesel engine to study the diesel spray and combustion. The first objective was to share the experimental results required by Engine Combustion Network (https://ecn.sandia.gov). In a first step, the penetration lengths for the vapor and liquid spray at the non-reactive standard Spray-A condition (900 K, 60 bar, and 22.8 kg/m 3 with pure nitrogen) were achieved from focused shadowgraphy and diffused-back illumination (DBI) [1]. A detailed understanding of the mixing between fuel and air can lead to more efficient combustion. This ...

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Assessment of a fast electro-optical shutter for 1D spontaneous Raman scattering in flames

Cited by 16 publications

References 23 publications

An algebraic alternative for the accurate simulation of CO₂ Raman spectra

X-ray diagnostics of dodecane jet in spray A conditions using the new one shot engine (NOSE)

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Assessment of a fast electro-optical shutter for 1D spontaneous Raman scattering in flames

Cited by 16 publications

References 23 publications

An algebraic alternative for the accurate simulation of CO2 Raman spectra

X-ray diagnostics of dodecane jet in spray A conditions using the new one shot engine (NOSE)

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An algebraic alternative for the accurate simulation of CO₂ Raman spectra